Improvement in car-brake shoes



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JOHN F'. ORTICE, OF FORT WAYNE, INDIANA.

IMPROVEMENT IN CAR-BRAKE SHOES.

Specification forming part of Letters Patent N0. 217.996, dated July 29,1879; application filed April 21, 1879.

To all whom it may concern:

Be it known that I, JOHN F. CURrIcE, of Fort Wayne, in the county ofAllen and State of Indiana, have invented a new and Improved Oar-BrakeShoe; and I do hereby declare that the following is a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, forming part of this specication, in which- Figure 1 is alongitudinal central section through line w m of Fig. 2. Fig. 2 is aface view of the curved shoe. Fig 3 is a crosssection through the line yy, and Fig. 4 is a cross-section through the line z z.

My invention is an improvement upon the car-brake shoe patented March2l, 1876, by I. H. Gongdon, in which detached pieces of wrought-iron areembedded in a body portion of cast-iron by casting the said body portionaround the wrought pieces, whereby the wearing-face of the shoe iscomposed in part of wrought-iron, and is enabled to better resist wear,and gives an increased friction for stopping the motion of the car.

In the patent referred to, the pieces of Wrought-iron (or steel) areWholly detached from each other, and are held in place by being beveledor undercut, or by the adhesion of the edges. The result of thisconstruction is, that the brake-shoe possesses no greater strength thanthe simple strength of the castiron, which is seriously impaired by thechilled edges around the wrought-iron pieces referred to, and whosethickness is already reduced by the space taken up by the saidWrought-iron pieces, necessitating by this method the use of a verythick and heavy, and therefore expensive, shoe to obtain even a moderatedegree of strength.

The object of my invention is to provide such a construction of thiscomposite brakeshoe as will, while retaining and even increasing thewearing qualities, also secure the requisite strength to resist thebreakage to which its use renders it liable, and at the same timealloysT the use of a much lighter and less eX- pensive shoe.

To this end it consists 'in forming the wrought portion of the face inthe form of a single bar, having a series of perforations, so that whenthe body portion of the shoe is cast thereabout, the cast-iron formsboth the margin of the Jface, and also forms tongues, which enter theholes of the wrought piece and appear on the face as patches of castmetal, whereby a system of joints in the metal is secured analogous tothat ot' tenons and mortises, which holds the two kinds of metal moresecurely together, while the continuous character and longitudinalarrangementot' the wrought piece together act as a splice to brace andstrengthen the weaker cast-iron body portion, as hereinafter fullydescribed.

In the drawings, A represents a brake-shoe formed in accordance with myinvention, with a wrought portion, a, and a cast portion, b. The wroughtportion a is constructed in the form of a single perforated bar, of alength and width very nearly equal to the length and width of thebrake-shoe, and bent to the curvature of the wheel. In combining the twometals the wrought bar is arranged in the mold in such relation as to beupon the inner 'side or concave face of the shoe and then when the castmetal is poured in it flows around the said bar to form the margin ofthe face,as at 1 1 l 1, and also ows through the holes in the saidwrought-iron bar in the form of tongues or tenons, which show throughthe face as isolated patches of cast metal occurring within the space ofthe wrought-iron, as at 2. This firmly unites the two metals uponImechanical principles, and as the wrought bar is a single piece arrangedlengthwise, it acts as a brace or splice to supplement the weakness ofthe cast-iron body which renders the shoe both durable and strong, andcapable of being made much lighter than by any other method.

The alternate recurrence of the wrought and cast metal also has abeneficial effect, in that the particles of one kind of iron aredistributed over the face of another kind of iron, and they thus actreciprocally to prevent glazing, which latter is objectionable, in thatit allows the wheels to slip by reason of insufficient friction.

It can be readily seen that instead of wroughtiron any other suitablemetal may be used in the wearing-surface of a car-brake shoe in themanner herein described.

What I claim is iron or other suitable metal, substantially as Acar-brake shoe consisting of a body of described.

cast-iron and an embedded face of wronghtiron 0I` other suitable metal,composed of :L single JOHN F' (JURTHE curved mld peitbmted lml arrangedlength- 'itnesses:

Wise, with the cust-iron appearing: nt he man C. R. HIGGINS,

gin and through tho holes in the wrought- R. J. FISHER.

